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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0fe1ecf6fe04967d17b890cf1b0f1c90b55fc46840f76c6ef7506fcc84a78f' 
  AND token = 'eT9TmGDVtI5U2F35ff3TQkrcqxd0QGX4X9e9XcknXRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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