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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec5b156cc4c41e295b8379dd3ab2be6148dbb3b5f3ed306464e444e42cbfe8b' 
  AND token = 'KkX2xMy8OWAliNL2kuADD9Z3Dnm1d7nQyiRrSGKMKd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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