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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7aa407162f4f9860e0f608d62054edf20ca7ec45036d64974a51623de29e8d' 
  AND token = 'x1e1ETv7alwZm0ZF3s03ThNGmw/btvV6pCNyZSs7njo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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