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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe288a191d0326706b0a0af58bbe4f389707651ad94cd1eafd7c67288f32f956' 
  AND token = 'p12SVwMQC1FTSQxSlWfTEUO2I5UlZ4fLnC4hNzrq1Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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