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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfd0ad7a03637c0b2929c4e8bcf30efeabbdbf83e72af43d7f5d3391a0d0f9b' 
  AND token = 'EnIcCdv6qzIuWAaqCGGZl7YaIX5Eb0roVWfBo+NIG+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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