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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6542069af28ea8bd1558e3ed4ac83fe9cddde709b9487f68248a97667ba8243' 
  AND token = 'rPv8+NqbIEdX4buyk3PdLnvNs6ciZmtN/qzb2bXq9DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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