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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bd536e5cca386fc3f30127ab0d4957b4ebc3d9fc803a1b5391d26002d35139' 
  AND token = 'd8ugOU9zV0ytoFEOvWelWGeP90vSBScpQky744oQwug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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