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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd223cc58770be7b8108bda12fabe4094d3c63867e5a05ddc5d12a91fb6d907dc' 
  AND token = 'hGpD1rysB4s6X0Y56s/M7vCGXikY3qBktNE7OYxk3Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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