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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966bc23643c60f33c6b9c0fd42c5a24929244edda6ef6e7c3602db753b5810d8' 
  AND token = '+48uU1Q3Aqcba3BR9b1cLbFcr1HLNWsTJErzJN6MYFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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