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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe751dff3963f50a59bc08107bea83c38b4e5b9c7c2cc687e3ce66b50446d2d' 
  AND token = 'M66umDlMBVB1pt1JbjrGEYkH7wN0fiuPdDy1vzm5BFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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