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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f108c82ffb6e1e20c6812de44968bd025a865b4409c93b3a9a4e93fa33c5387' 
  AND token = 'CptPxVvYFQf/wVeZ3C4Ssc8OzjzZot2lCUDtoyNezjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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