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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd5b4c0d1db65aef59cc12da2394da341c26eb9b95f296f1360bb6774c9236e' 
  AND token = 'ycXbfBHeLlGyIL7mHZ6hzgdyzQdpwApblhDE2gk+0/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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