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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd5ec3d2d5081c338bb518ecee20fa7d75faa5ef7fc5dd0e18a9a0053e75896' 
  AND token = '4KMrYxXsbe7NvQRr4Y2N2fZtUo93O0oOXkqdZekyfek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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