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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8207c91471336c3ed54b3ad2fc5ed46a07daa00d3b22637c1ba91b40ebd754' 
  AND token = 'EPBz20oxMaccp4v9XI3Wk2BDo1+2v6SNPaNKzh+q+ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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