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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a45e5ed73ff31b082997198afa7f4e7c9c763a9e1e1a71ab7cd660350a69bdf' 
  AND token = 'f9m86R5Rud51YS38IN2fp1DSkVDyCEbGD+cZ4iJciFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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