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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21eac0e8d9d058a5e5278e62bb6673f4fbad17c18ce5de059f4f254d9f95c180' 
  AND token = 'nAt+roYqlSswtq7cB5uQYQYoe3j3/LMwi6xNCkN2c5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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