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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc507eb12263d1a5aa54878782c210d536e692a76a8508509835474a1b52314e' 
  AND token = 'ked2Q//p+oPDN4R4Uu4O+GtHjAba++BYuOw86ANCMBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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