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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7939c0196c4a807090ef8587b0bb431bc2d0fc5de7be542a19a676179dbb16' 
  AND token = 'MVdqIYq65vHJvKYeLydEVmgRgNAxqsmT3jgULekD28s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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