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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51d6f3dc9068e9b46aff278096bd637e3437ce1a7dce4d726613c5d3e79532c' 
  AND token = 'IPfMKa9TyaMjRULabNrBk6ac0kqXJnamXWR31A258X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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