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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952432d177180f95d3ffdda4e3b8ce30378720e6a5af10fc6654f6a5a1e0c403' 
  AND token = 'tsMVfdoKYK8KW4IA5RhWKTO5JjbdVFej89/kcTavNuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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