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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2ccc2033685e58f05a7cb89d3a71442c86c9243d83c67a3bc616b5655bff3c' 
  AND token = 'Ak8y6lpYCjx5Xl36Ofg9K54S8wVv00HcT/x82XP01gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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