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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6802c97f37461a94e640e5d4ed43c824b092fbc1cbb4afeb03d267aa4742791' 
  AND token = '4fRu3J5gaL0IzdqduahYZtjL7gdYJSJTLoeE8INTGTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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