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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd83fe524778276701e16ebfc83d709c71cdbb5ae23e26d7fa029eec4eaf8532' 
  AND token = 'vxESYl1E7Vuhlb0HWhEVwYfvAL6bMrE2jiLxip47XMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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