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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2902e8ed36436b7d5e88381489a3c4e1167d28535c8ea779057d2057fc2e1b4d' 
  AND token = 'DH09GcaMuCuHND9wPcxQpk81UtHoLPUoLhYySTqcztQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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