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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55dac98d16ecac578e0490b841bfe7a1f626b1a24e698af07a75fe20df1354fd' 
  AND token = 'WXvIbvr3c9PGygminLtR/ij72wLDL3kU0GuXhGWX1jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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