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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e9df199a41e21a16f94fc122ad1e74e39cbc0af684e42c81670acdfcc85084' 
  AND token = '3mfUzDneMOl0hnelp/abjeYdiv6ure3YIG1UN39L9TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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