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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b3824c2ffa7cf0d587a364622ee022ef597d8c8abdeb1f9c086fae815c17a5' 
  AND token = 'KkQ22iDkvNcwOtdw9LA/ll5WNi1xey5XfxFfyoxqIGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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