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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993230a9a8fe34fadbb95108cf491c8d0c6064fe8b9ad9562a84d11538a338e9' 
  AND token = 'NMD/vvZF65vMNXXU1MngrqucFL5HpnWjr9QEaqEct8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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