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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee2bb458de243f4b43690ea417c74c2ee86b121680bccc25c0818276875740e' 
  AND token = 'S4ufltO8a9i4EGktgKTF0ZweqFDfTRTe90Wx0asHkB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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