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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128c7e6604a88e5a2d1284bf1a580760ae4852b9fae2148c9509757bfabb7335' 
  AND token = 'sRSd+IF3R25RK2OP5WTfRTiopjKHWKXBxz+PzEnx0j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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