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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e671d2e509d665a5428f4f15339f3882693cc8df8f9b6cd16fd9daa56e7f81e' 
  AND token = '6jBhwv1Sjm4aSuTPZQZL68UBX7StP5QtSUmzEAn9T4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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