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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0b2df382ccc36c163c32c4b5527abcefee1e4be0f8407a783b230a56b73e95' 
  AND token = 'mY4iArCX5UUfSp52UWUnscV45ie1WXcvKni9uxEq5QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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