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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a50fbe42a3e2c9312aff90a460db0adc00889008b43863923c1b4e0bddc2a9cd' 
  AND token = '7igw0aR0sul4oG603qwDqsEV/pkpjeY+IL0KRqwGgzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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