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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee754c006a0ea58cc33e65c115fd5c03c40f4e13c39bd0f14b90b1885e50bc8c' 
  AND token = '9vK5hxwoGTPKWV3L+BkerOWZfTan9CNjrlrRiTMmBgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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