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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9477ea4b689e656f2b4936dcf452bc62b1efeea546e23049b3daad677f3644fe' 
  AND token = 'Bo7A+rz7VEgVHU45NAoDHpuIXs7KlEHDH6PYb+Wex7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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