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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95dffcd631c93fcdda085974d2a7df1b6f8352e641cca55e1ae2189674fc3972' 
  AND token = 'svEm5U8USMe/BUJV7y71zr3ioQqoOfEFethAQOMZk9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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