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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef106bcdb466c91470bac0fe6a96cea4614f5f67ca9d06054bd68fbc8201c6a' 
  AND token = 'wEacQOJnLao9zcT59JelaRtidAbt/4EOY59jJMqJGUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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