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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62be9fff4a09d46606481f42552d59c996c2f2c68c9b3a3a73fd0f727828c44' 
  AND token = 'SkCbnx7HqSaqyHhnRG/egn4AfHcKX+h/H6MSExYrgxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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