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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635349d168153b89ede43d662dccd93cc717a0a6718d3ab013bfc28c8c5110dc' 
  AND token = '7NR9/Jgq3q/WeBD6y3CdcmmA98u1fj08NMU3qlqyLcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}