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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b556d0e523a54db345677d3e54d0b8d2a4d2f163f2428f5f111ecfcf454ba2' 
  AND token = 'Oa0KHjP+Q89h40SbSHJX55RDsvvF/6GyEiMxZfh+yhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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