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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac129fad3eeb2df6add712047f75746e4229f2b6dd004a0915f1677696c7956' 
  AND token = 'Em0fRG9BrsmJSEy+y1p5MGV22uUYO3ouy2eE6KUY5zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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