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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e51214422fda37e4a8b98587df8a998779a615bda6fd3a459cb03feb6b7900' 
  AND token = 'bKg4FyxhihAr98qhgaAB9JrZBk4+ZIG2moiklx659TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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