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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8dbed3bf7dd78b4d84097f7777a131b9700ba5cb3372922b7899dafa990ef4' 
  AND token = 'IxE2oy2cH8Ijeob3JPa+8Z10Qd9fq48E7J9WbPkkNiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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