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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e1de216f56bbdd702fa3a63eae900805acfac8a11282259b2643f27675f3d9' 
  AND token = 'uGLbc48NuD0lAbk8Z19JgmuVAiyFts1rDnf4fclr0mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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