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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be95429850b0c94e7e9ba177ef23cbd8125b124a910843c17fd0626037fec56d' 
  AND token = 'GmP4dxGtfcZdSYF7A7GgSzzlIIxzAuyfrT/Y+X3kAZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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