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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b3be105c18624bfe254f2ce2d5db4822d76746147b80c8eba2d5f8bab4044f' 
  AND token = 'pRmuQatLbyUwFxZDik3+mCs08cv2ySK7GfGFfVAoTD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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