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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d6083bc1d89c51d5575da6bafe87a604b4026a743ffc35f19a6fe7d0d3e2fa' 
  AND token = '2mFkoVjiJAXfy+58laOd/oIJHm1mnErCbcKaS4S2utw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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