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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c97046b05fe1f998d2d5075d5b7945588d0757af6ad4bd1f10169c123254f5b' 
  AND token = 'VEEaI+7NSpK3AJMJhpNvvsEM6D6LaHfLU5AX5X0vDPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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