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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c7d543d533a6dbda632365a2e51000d563a77fd043879004609d559fbce5ab' 
  AND token = 'B7SBrOdm/vLG1YMIogJ6p2gKnTLIDIxrGWtLSS/rGzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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