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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0acf9fa249ba9c9f9032f23b71a7aa608bffe680726dc53782fcdd0483067f4' 
  AND token = '7XcxY/HIkgcRIkLrHKEGuYZqu2Cl9iDkCzcLIIB9HBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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